Fix check plugins: zuul.projects is now a dict

zuul.projects was recently moved to a dictionary, so looping over
it needs some fixes in order to have openstackclient-check-plugins
working again.

Change-Id: I0b69a05374ad48831304e91c7f0801d351aa1a22

playbooks/openstackclient-check-plugins/run.yaml

@@ -10,8 +10,9 @@
     - shell:
         cmd: |
           echo "------------------------------------------------------------"
-          osc_plugins/bin/pip install -e src/git.openstack.org/{{ item }}
-      with_items: "{{ zuul.projects | selectattr('required') | map(attribute='name') | list }}"
+          osc_plugins/bin/pip install -e src/{{ item.key }}
+      when: item.value.required
+      with_dict: "{{ zuul.projects }}"
 
     - shell:
         cmd: |